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System and method for seamless handoff of WLAN-UMTS interworking

a technology of wlan and interworking, applied in the field of handoff between heterogeneous networks, can solve the problems of considerable delay and packet loss, inflexible application, pre-registration handoff scheme, etc., and achieve the effect of fast and seamless hando

Active Publication Date: 2008-06-24
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces handoff delay and packet loss by completing authentication and registration processes before L2 handoff, ensuring fast and seamless transitions while maintaining service continuity.

Problems solved by technology

The pre-registration handoff scheme, which operates based on Mobile IP, is not flexible when applied to a WLAN-UMTS interworking configuration, and must be adapted to perform an actual handoff process in WLAN and UMTS networks, as well as meet the requirements of the networks.
This causes a considerable delay and packet loss problem during actual handoff between the WLAN and UMTS networks.

Method used

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  • System and method for seamless handoff of WLAN-UMTS interworking
  • System and method for seamless handoff of WLAN-UMTS interworking
  • System and method for seamless handoff of WLAN-UMTS interworking

Examples

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first exemplary embodiment

[0045]In a first exemplary embodiment of the present invention, a UE 201 performs a pre-registration handoff process of collectively performing authentication, IP address allocation and registration through a Pre-Registration Request message.

[0046]FIG. 3 depicts a signaling diagram illustrating the overall operation in which a UE 201 performs pre-registration handoff from a WLAN AN 210 to a UMTS network 250, according to a first exemplary embodiment of the present invention. Referring to FIG. 3, packet exchange between a WLAN AN 210 and a HA 215 is performed in step 300. If a UE 201 determines that the handoff is in response to an L2 trigger, step 302, the UE 201 delivers a Pre-Registration Request message for requesting pre-authentication and pre-registration to an SGSN 208 via a GGSN / FA 209 of a UMTS network 250 through a WLAN AN 210, step 304. Herein, the Pre-Registration Request message includes such information as an IPUE and an IMSI of the UE 201, and the WLAN AN 210 holds add...

second exemplary embodiment

[0058]In a second exemplary embodiment of the present invention, a UE 201 first performs a pre-authentication process through Pre-Authentication Request / Response messages, then performs a pre-registration process through Pre-Registration Request / Response messages after completion of the pre-authentication process.

[0059]FIG. 4 depicts a signaling diagram illustrating the overall operation in which a UE 201 performs pre-registration handoff from a WLAN AN 210 to a UMTS network 250, according to a second exemplary embodiment of the present invention. Referring to FIG. 4, packet exchange between a UE 201, with an IPWLAN located in a WLAN AN 210, and a HA 215 is performed in step 400. If the UE 201 determines that the handoff is in response to an L2 trigger, step 402, the UE 201 delivers a Pre-Authentication Request message for requesting pre-authentication to an SGSN 208 via the WLAN AN 210 and a GGSN / FA 209, step 409. The Pre-Authentication Request message includes an IPUE and an IMSI ...

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Abstract

A seamless handoff system and method reduces delay and packet loss during handoff of user equipment (UE) from a Wireless Local Area Network (WLAN) network to a Universal Mobile Telecommunication System (UMTS) network. The handoff system and method performs pre-registration and pre-authentication processes before the occurrence of a handoff, buffers packets being delivered to a UE during a handoff period, and forwards the buffered packets to the UE after completion of the handoff, thereby reducing packet loss that can occur during handoff.

Description

PRIORITY[0001]This application claims the benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 2004-98232, filed Nov. 26, 2004 in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to handoff between heterogeneous networks. More particularly, the present invention relates to a handoff method for improving delay and packet loss which may frequently occur when a mobile node (MN) performs handoff from a Wireless Local Area Network (WLAN) network to a Universal Mobile Telecommunication System (UMTS) network.[0004]2. Description of the Related Art[0005]Mobile (Internet Protocol (IP)) Working Group of Internet Engineering Task Force (IETF), an international standardization organization, proposes a pre-registration handoff method as one of the methods capable of supporting a low delay during handoff. The pre-registratio...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04Q7/00H04Q7/20H04W8/26H04W12/02H04W12/06H04W36/14H04W36/24H04W80/04H04W84/04H04W84/12
CPCH04L63/0869H04W12/06H04L63/04H04W8/26H04W12/02H04W36/0016H04W80/04H04W12/062H04W36/14
Inventor BAE, EUN-HUISONG, O-SOKCHOI, SUNG-HOCHO, DONG-HOCHOI, HYUN-HO
Owner SAMSUNG ELECTRONICS CO LTD
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